JP6267751B2 - Measuring apparatus and measuring method - Google Patents

Description

Cross-reference of related applications

  This application claims the priority of Japanese Patent Application No. 2012-256654, filed in Japan on November 22, 2012, the entire disclosure of which is hereby incorporated by reference.

  The present invention relates to a measuring device and a measuring method for evaluating an earphone type or headphone type acoustic device that accommodates a housing having a vibrating body inside an ear of a human body or presses it against the ear to hear sound by vibration transmission. Is.

  Patent Document 1 describes an acoustic device such as a mobile phone that transmits air conduction sound and bone conduction sound to a user. Patent Document 1 describes that air conduction sound is sound that is transmitted to the eardrum through the ear canal through the vibration of the air due to the vibration of the object, and is transmitted to the user's auditory nerve by the vibration of the eardrum. Has been. Patent Document 1 describes that bone conduction sound is sound transmitted to the user's auditory nerve through a part of the user's body (for example, cartilage of the outer ear) that contacts the vibrating object. ing.

  In the telephone set described in Patent Document 1, it is described that a short plate-like vibrating body made of a piezoelectric bimorph and a flexible material is attached to the outer surface of a housing via an elastic member. Further, in Patent Document 1, when a voltage is applied to the piezoelectric bimorph of the vibrating body, the vibrating body bends and vibrates as the piezoelectric material expands and contracts in the longitudinal direction, and the user contacts the vibrating body with the auricle. It is described that air conduction sound and bone conduction sound are transmitted to the user.

  In addition to the phone that conveys sound by hand and by pressing it against the ear, the cartilage conduction earphone that is used by being hooked and held somewhere on the human head, Headphones are known.

JP 2005-348193 A

  Then, the inventor evaluates an acoustic device that transmits a bone conduction sound through the cartilage of the outer ear to the user, such as a cartilage conduction earphone or a headphone that is used while being hooked and held somewhere on the head of the human body. It has been recognized that it is necessary to measure the amount of vibration that acts approximately on the auditory nerve of the human body due to the vibration of the vibrating body.

  The present invention has been made in view of the above-described recognition, and a measuring device that can measure a vibration amount weighted by vibration transmission characteristics of a human ear and can evaluate an acoustic device such as an earphone or a headphone having a vibrating body, and The object is to provide a measurement method.

  The present invention is a measuring device for evaluating an acoustic device that allows sound to be heard by vibration transmission to a human ear, and includes an ear model imitating a human ear and an artificial external auditory canal portion connected to the ear model, rubber, or IEC60318. The ear model is provided with an ear mold portion made of either the same material as the auricle model compliant with -7, the same material as the auricle model compliant with IEC 60268-7, or a material with a shore hardness of 30 to 60. Is formed with an auricle for holding the acoustic device or a hole for holding the acoustic device, and around the artificial ear canal in a plane intersecting an extending direction of the artificial ear canal of the artificial ear canal portion. And a vibration detecting element for measuring vibration from the acoustic device transmitted from the hole.

  According to the present invention, it is possible to measure the amount of vibration in consideration of the characteristics of vibration transmission to the human ear, and it is possible to evaluate an earphone having a vibrating body, a headphone type acoustic device, a hearing aid, and the like.

It is a figure which shows schematic structure of the measuring apparatus which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing which shows an example of the earphone of a measuring object. FIG. 2 is a partial detail view of the measuring apparatus of FIG. It is a partial detail drawing which shows the modification of the measuring apparatus of FIG. It is a functional block diagram of the principal part of the measuring apparatus of FIG. It is a figure which shows schematic structure of the measuring apparatus which concerns on 2nd Embodiment of this invention. FIG. 7 is a partial detail view of the measuring apparatus of FIG. FIG. 7 is a partial detail view showing a modification of the measuring apparatus of FIG. 6.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing a schematic configuration of a measuring apparatus according to the first embodiment of the present invention. The measuring apparatus 10 according to the present embodiment includes an ear mold portion 50 supported by the base 30 and a human body model portion including a holding portion 70 that holds the acoustic device 100. In the following description, a cartilage conduction earphone as an example is shown as the acoustic device 100. As shown in the cross-sectional view of FIG. 2, the acoustic device 100 includes a housing 101 that is embedded in a hole of a human ear, includes a piezoelectric element 102 inside the housing, and vibrates the housing 101 by the piezoelectric element 102. It is something to be made.

  First, the ear mold 50 will be described.

  The ear mold portion 50 imitates a human ear, and is an ear model 51, an artificial external ear canal portion 52 that is coupled to or integrally formed with the ear model 51, and an artificial external ear canal portion 52 that is coupled to or integral with the artificial external ear canal portion 52. And an artificial tympanic membrane part 57 formed on the surface. The artificial external auditory canal portion 52 has a size that covers the ear model 51, and an artificial external ear canal 53 is formed at the center. The ear mold 50 is supported by the base 30 via a support member 54 at the peripheral edge of the artificial external ear canal 52.

  The ear model 51 includes an auricle, an auricular nodule, a scaphoid fossa, an antiaural ring, a conch boat, an auricular cavity, an antitragus, an appendix, an tragus, an auricle leg, a lower leg of an auricle, a triangular fossa, and an auricle Either a leg or a notch between the beads may be provided. Thereby, it can cope with holding | maintenance of the audio equipment which has various structures and is hold | maintained at the site | part of various ears. For example, in the case where the acoustic device is held so as to stretch between the lower leg of the anti-annular ring and the notch between the beads, it is preferable that the lower leg of the ear-ring and the notch between the ears are provided. That is, the holding unit includes an anti-ankle lower leg and a notch between the beads. In addition, it measures an acoustic device including a main body having an ear hook part between the ear ring and the temporal region, and a vibration part that is vibrated by an audio signal supplied from the main body and embedded in the concha cavity. In this case, the ear model 51 may include an ear ring, a temporal region, and a concha cavity as a holding unit. The ear model 51 includes an auricle, an auricular nodule, a scaphoid fossa, an antiaural ring, a conch boat, an auricular cavity, an antitragus, an appendix, an tragus, an auricle leg, a lower leg of an auricle, a triangular fossa, and an auricle Either a leg or a notch between the beads may be provided. Thereby, it can cope with holding | maintenance of the audio equipment which has various structures and is hold | maintained at the site | part of various ears. For example, in the case where the acoustic device is held so as to stretch between the lower leg of the anti-annular ring and the notch between the beads, it is preferable that the lower leg of the ear-ring and the notch between the ears are provided. That is, the holding unit includes an anti-ankle lower leg and a notch between the beads. In addition, it measures an acoustic device including a main body having an ear hook part between the ear ring and the temporal region, and a vibration part that is vibrated by an audio signal supplied from the main body and embedded in the concha cavity. In this case, the ear model 51 may include an ear ring, a temporal region, and a concha cavity as a holding unit.

  The ear mold part 50 is made of, for example, a material similar to the material of an average ear model used for, for example, HATS (Head And Torso Simulator) of a human body model or KEMAR (a name of an electronic mannequin for acoustic research of Knowles). You may consist of the raw material based on IEC60318-7 or IEC60268-7. This material can be formed of a material such as rubber having a Shore hardness of 30 to 60 (for example, Shore hardness 35 or Shore hardness 55).

  The thickness of the artificial external auditory canal 52, that is, the length of the artificial external auditory canal 53 is suitable as long as it corresponds to the length of the human eardrum (cochlea), and is appropriately set within a range of 5 mm to 40 mm, for example. In the present embodiment, the length of the artificial external ear canal 53 is approximately 28.5 mm.

  The artificial eardrum unit 57 is formed at the end of the artificial external ear canal unit 52 so as to block the artificial external ear canal 53, and vibration from the artificial external ear canal 53 is transmitted to the artificial eardrum unit 57.

The artificial eardrum portion 57 is made of a material similar to an average ear model material used for, for example, human body models such as HATS and KEMAR, for example, a material conforming to IEC60318-7 and IEC60268-7, and is a thin film. is there. In general, the thickness may be, for example, about 0.05 mm to 2 mm so as to reproduce the response to vibration of the human eardrum. Further, a portion contacting the space of the artificial ear canal 53 of the artificial eardrum 57, that is, the area of the exposed portion towards the artificial ear canal 53, may be closer to the size of the average eardrum of a human body, for example, 0.5 cm ² ~ What is necessary is just a circular shape of about 2.5 cm < ² >, an ellipse shape, or a rectangular shape.

  The artificial eardrum portion 57 is not limited to the materials and thicknesses described above, and is a biological material mainly composed of a polymer aminoglycoside extracted from the shell of red snow crab, which is a general artificial eardrum material, or calf dermis It may consist of a biomaterial whose main component is a component purified from the collagen. Rather than attaching an artificial eardrum made of these biomaterials to the artificial external ear canal part 52, an artificial eardrum is formed from a material compliant with the above-mentioned IEC60318-7 or IEC60268-7, and the artificial eardrum made of the material is used as described above. The thickness and area may be adjusted so as to approach the physical characteristics of an artificial eardrum made of a biomaterial. Or processed products of natural products such as rubber membranes, rubber balls, paper pieces, collodion membranes, egg membranes, cellophane, polytetrafluoroethylene, silicone membranes, collagen, fibrin membranes, etc., which have been used for tympanic membrane perforation repair materials. Or an artificial material. The artificial eardrum portion 57 made of these materials is an adhesive selected in consideration of the materials of the artificial ear canal portion 52 and the artificial eardrum portion 57 so as to block the artificial ear canal 53 at the end portion of the artificial ear canal portion 52. It may be fixed by. Of course, the ear mold part 50 may be made of the same material as the artificial external auditory canal part 52 and the ear model 51 or from a different material by integral molding using a mold.

  In the ear mold unit 50, a vibration detection unit 55 is disposed on the artificial eardrum unit 57 on the end surface of the artificial external ear canal unit 52 on the side opposite to the ear model 51 side. The vibration detector 55 may be on the ear model side. The vibration detection unit 55 includes a vibration detection element 56 such as a piezoelectric acceleration pickup, for example. 3A is a plan view of the ear mold portion 50 as viewed from the base 10 side, and FIG. 3B is a cross-sectional view taken along the line bb of FIG. 3A. FIG. 3A illustrates a case where a plurality of chip-shaped vibration detecting elements 56 are arranged on the artificial eardrum portion 57, for example. One vibration detection element 56 may be provided. When a plurality of vibration detection elements 56 are arranged, they may be arranged at appropriate intervals around the artificial eardrum portion 57 and the artificial ear canal 53, or in an arc shape so as to surround the opening periphery of the artificial ear canal 53. The vibration detection element 56 may be disposed. In FIG. 3A, the artificial external auditory canal portion 52 has a rectangular shape, but the artificial external auditory canal portion 52 may have an arbitrary shape. For example, the vibration detecting element 56 may be embedded in the artificial eardrum portion 57 so that only the lead wire is drawn out of the artificial eardrum portion 57 or attached to the artificial eardrum portion 57 with an adhesive or the like. It may be.

  The vibration detecting element 56 disposed in the artificial eardrum 57 can mainly reproduce the vibration of cartilage conduction in the eardrum. For example, it is possible to obtain information for converting the sound into the same level as the vibration of the artificial eardrum portion 57 in the air conduction sound. In FIG. 3, the vibration detection element 56 is disposed in the vicinity of the center portion of the artificial eardrum portion 57 and in the peripheral portion of the artificial eardrum portion 57. The vibration detection element 56 at the center can measure the vibration of cartilage conduction in the artificial eardrum 57. Further, when arranged on the side surface of the artificial external ear canal 53, the behavior of vibration from the ear to the inner ear on the side surface of the external ear canal 53 can be measured. Further, the vibration detecting element 56 disposed around the artificial eardrum portion 57, that is, outside the artificial external ear canal 53 in FIG. 3A, measures a vibration component transmitted from the external auditory canal to the inner ear without passing through the eardrum. can do.

  As the chip-like vibration detecting element 56, for example, a commercially available one such as an ultra-compact and lightweight NP-2106 manufactured by Ono Sokki Co., Ltd., PV-08A, PV-90B manufactured by Rion Co., Ltd., or the like may be selected as appropriate. Good. For example, in the case of PV-08A manufactured by Rion Co., Ltd., the weight is about 0.7 g, but by adding the weight, the vibration characteristics of the artificial eardrum portion differed from the vibration characteristics of the actual human eardrum. In consideration of becoming a thing, the weight of the artificial eardrum portion 57 may be reduced in advance. And the vibration detection element 56 of about 0.2g is lightweight and suitable like TYPE7302 by the Accor company.

  The vibration detection element 56 in the artificial eardrum unit 57 is a result of vibration of the eardrum caused by a so-called air conduction component that is emitted from the acoustic device as air conduction sound and reaches the eardrum, and the inner wall of the artificial ear canal 52 is vibrated by vibration of the acoustic device. The eardrum vibration due to the emitted radiation component in the external auditory canal and the component that itself vibrates the eardrum are detected in a simulated manner.

  Next, the holding unit 70 that holds the acoustic device 100 such as an earphone will be described. When the acoustic device 100 is a cartilage conduction earphone, the earphone housing 101 is partially or entirely embedded in the ear hole. Since the ear mold part 50 faithfully mimics the shape of a human ear and naturally includes an auricle or an external auditory canal, it is preferable to embed an earphone in the auricle or the external auditory canal.

  FIG. 4 shows a modification of the ear mold 50. The ear mold 50 does not have the artificial eardrum 57 and includes a vibration detection element 56 at the rear end of the artificial ear canal 53, that is, on the back surface of the artificial ear canal 52. In this case, a vibration component transmitted to the inner ear without passing through the so-called eardrum in the human body, for example, a component (bone conduction component) transmitted to the inner ear via the jaw bone or the temporal bone can be measured. Also in this example, the vibration detecting element 56 is disposed on the side surface of the artificial external ear canal 53. Thereby, the behavior of the vibration from the ear toward the inner ear on the side surface of the external auditory canal 53 can be measured. In order to measure these plural components, a plurality of vibration detection elements 56 are provided, and the total sense of hearing can be detected by adding the measured values calibrated for each output value. The calibration width of each output value may be adjusted by obtaining a transfer function converted to the air conduction sound base by a conventionally known threshold method or adjustment method.

  FIG. 5 is a functional block diagram of the main part of the measuring apparatus 10 according to the present embodiment. One or more vibration detection elements 56 are connected to the signal processing unit 75. The signal processing unit 75 measures the amount of vibration in the artificial ear canal unit 52 or the artificial eardrum unit 57 by the acoustic device 100 based on the output of the vibration detection element 56 (each). Further, the signal processing unit 75 measures the audibility based on the measured vibration amount. These measurement results are output to an output unit 76 such as a display unit, a printer, or a storage unit, and are used for evaluation of the acoustic device 100. The measurement includes analyzing the frequency characteristics of the generated air conduction sound and vibration sound by processing such as fast Fourier transform.

  As described above, according to the measurement apparatus 10 according to the present embodiment, it is possible to measure the vibration level in which the vibration transmission characteristics of the human ear are weighted, so that the acoustic apparatus 100 can be correctly evaluated.

  Further, as in the modification shown in FIG. 4, when the microphone 58 supported in a hollow manner is provided in the artificial external ear canal 53 or the terminal end of the artificial external ear canal 53, air conduction through the artificial external ear canal 53 simultaneously with the vibration level. The sound pressure can also be measured, and thereby the audibility level in which the vibration level corresponding to the cartilage conduction and the sound pressure level corresponding to the air conduction sound pressure are combined can be measured, so that the acoustic device 100 can be evaluated in more detail. It becomes. The radiation component in the external auditory canal that has become an airway component from vibration inside the artificial external ear canal 53 can be measured.

  The correlation between the vibration level corresponding to the cartilage conduction and the sound pressure level corresponding to the air-conducted sound pressure is determined by a large number of actual subjects at the beginning of creating the measurement device in advance, as is well known in the art. Through experiments, correlation data between the audibility of vibration sound pressure using only a vibration sound source and the audibility of air conduction sound pressure using only an air conduction sound source, the audibility of each sound pressure when having a vibration sound source and an air conduction sound source, and air conduction It can be obtained by appropriately referring to correlation data with the audibility of the air conduction sound pressure by only the sound source.

(Second Embodiment)
FIG. 6 is a diagram showing a schematic configuration of a measuring apparatus according to the second embodiment of the present invention. In measuring apparatus 110 according to the present embodiment, the human body model portion further includes a human head model 130. The head model 130 is made of, for example, HATS or KEMAR. The artificial ear 131 of the head model 130 is detachable from the head model 130.

  As shown in a side view of the artificial ear 131 removed from the head model 130 in FIG. 7A, an ear model 132 similar to the ear mold unit 50 of the first embodiment and the ear model 132 are coupled. And an artificial external ear canal portion 134 in which the artificial external auditory canal 133 is formed, and a membrane-like artificial eardrum portion 137 disposed at the end of the artificial external ear canal portion 134. In the artificial external auditory canal portion 134, a vibration detection unit 135 including a vibration detection element 136 is disposed around the opening of the artificial external ear canal 133, similarly to the ear mold portion 50 of the first embodiment. The artificial ear 131 is detachably attached to an attachment portion 138 formed on the side surface of the head model 130 as shown in FIG.

  The holding unit 150 includes an auricle or a hole of an ear that communicates with the artificial external ear canal 133 of the artificial external ear canal unit 134 for holding the acoustic device 100 such as an earphone.

  According to the measuring apparatus 110 according to the present embodiment, the same effects as those of the measuring apparatus 10 according to the first embodiment can be obtained. In particular, in the present embodiment, since the acoustic device 100 is evaluated by detachably attaching the artificial ear 131 for vibration detection to the human head model 130, an actual usage mode in which the influence of the head is taken into consideration. This makes it possible to evaluate more appropriately.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible. For example, in the above embodiment, the acoustic device 100 to be measured is assumed to be an acoustic device such as an earphone, in which the piezoelectric vibrator 102 vibrates and transmits vibration to the housing 101 and vibrates to the ear via the housing. However, it can be used to cover the entire ear, such as headphones held by a person's head, or to transmit vibrations to the ear by an acoustic device provided on a head-mounted display, or to the vine part of glasses. Even if the vibration element is embedded and the vine vibrates to transmit the vibration sound, it can be similarly evaluated by easily deforming the holding portion that holds the acoustic device.

  In FIG. 8, the modification of the measuring apparatus of FIG. 6 is shown. The measuring apparatus shown in FIG. 8 does not have the artificial eardrum 137 in the artificial ear 131 and includes a vibration detecting element 136 at the rear end of the artificial external ear canal 133. In this case, the vibration component transmitted to the inner ear without passing through the eardrum in the human body can be measured. Also in this example, the vibration detecting element 136 is disposed on the side surface of the artificial external ear canal 133. Thereby, the behavior of vibration from the ear toward the inner ear on the side surface of the external auditory canal 133 can be measured.

  Further, as in the modification shown in FIG. 8, in the case where the microphone 139 is supported in the artificial external ear canal portion 133 so as to be hollow, the air conduction sound pressure in the artificial external auditory canal 133 can be measured simultaneously with the vibration level. Since the audibility level obtained by combining the corresponding vibration level and the sound pressure level corresponding to the air conduction sound pressure can be measured, the acoustic device 100 can be evaluated in more detail.

  The correlation between the vibration level corresponding to the cartilage conduction and the sound pressure level corresponding to the air-conducted sound pressure is determined by a large number of actual subjects at the beginning of creating the measurement device in advance, as is well known in the art. Through experiments, correlation data between the audibility of vibration sound pressure using only a vibration sound source and the audibility of air conduction sound pressure using only an air conduction sound source, the audibility of each sound pressure when having a vibration sound source and an air conduction sound source, and air conduction It can be obtained by appropriately referring to correlation data with the audibility of the air conduction sound pressure by only the sound source.

(Third embodiment)
Next, a measurement method according to an example using the measurement apparatus of the present invention will be described below.

  For example, various determinations can be made by the measurement steps described below. (1) The acoustic device 100 that generates vibration is attached to the measurement device in a predetermined posture. (2) The acoustic device is driven with a predetermined power. (3) The detection result of the vibration detection unit is obtained by the measuring device.

  Basically, this is sufficient, but it is also effective to compare with the measurement result of the air conduction sound pressure obtained as follows, for example. That is, before or after, (1) an acoustic device that generates vibration is attached to the measuring device in a predetermined posture. (2) The acoustic device is driven with a predetermined power. (3) A normal air conduction volume is measured in a measuring device in which a microphone is mounted in a hollow shape in the ear canal of an ear mold such as HATS or KEMAR of a well-known human body model that does not include an eardrum unit. (4) Then, the correspondence between the measurement result of the vibration amount of the artificial eardrum obtained by the measurement apparatus of the present invention and the measurement result of the air conduction volume is taken. Thereby, a so-called correlation between the air conduction volume and the artificial eardrum, that is, a transfer function can be easily obtained. In this case, when the same acoustic device is used, each of the air conduction volume and the vibration amount with respect to the same applied power is measured. That is, each correlation in the same acoustic device is obtained.

  On the other hand, the following measurement using another acoustic device is also effective. In other words, the measurement device of the present invention detects the amount of vibration when driven by applying the same power using a speaker that outputs 150 dB at the air conduction volume. As a result, the vibration amount of the artificial eardrum when a 150 dB sound is heard can be measured.

  Next, the vibration amount equivalent to 150 dB is detected in the above-described air conduction volume by using an acoustic device that transmits sound only by vibration sound or vibration sound and air conduction sound. Thereby, the vibration amount equivalent to the air conduction volume of a general speaker can be measured. In an acoustic apparatus that can output both sound due to vibration transmission and air conduction sound, the vibration amount equivalent to 150 dB is measured by combining the sound due to vibration transmission and the air conduction sound. In an acoustic apparatus that performs only vibration transmission, it is possible to measure a vibration amount equivalent to 150 dB, which is a general air conduction volume.

  As a method of using such a measurement method for comparison, for example, it is possible to specify the amount of vibration of the artificial eardrum corresponding to a large volume that is said to be at risk of rupturing the eardrum at the air conduction volume, and thus obtained knowledge Based on the above, it is possible to contribute to the production of an acoustic device in consideration of safety, such as limiting the upper limit value of the vibration amount. Alternatively, since the correlation between the air conduction volume and the amount of vibration in the artificial eardrum can be grasped, for example, the design and the like in a portable acoustic device for a highly deaf person becomes easy. That is, it becomes easy to set the lower limit or the upper limit value of the corresponding vibration amount by using the data related to the hearing of the highly hearing-impaired person based on the air conduction sound ascertained in advance in a hospital or the like.

DESCRIPTION OF SYMBOLS 10 Measuring apparatus 30 Base 50 Ear mold part 51 Ear model 52 Artificial ear canal part 53 Artificial ear canal part 54 Support member 55 Vibration detection part 56 Vibration detection element 57 Artificial ear part 58 Microphone 70 Holding part 100 Acoustic apparatus 101 Housing 102 Vibration element 110 Measuring device 130 Head model 131 Artificial ear 132 Ear model 133 Artificial ear canal 134 Artificial ear canal part 135 Vibration detection part 137 Artificial eardrum part 138 Wearing part 139 Microphone 150 Holding part

Claims (8)

A measuring device that evaluates an acoustic device that hears sound through vibration transmission to the human ear,
Including an ear model imitating the human ear and an artificial external auditory canal part connected to the ear model, rubber, the same material as the auricle model in accordance with IEC 60318-7, the same material as the auricle model in accordance with IEC 60268-7, or While having an ear mold portion made of any material having a Shore hardness of 30 to 60,
The ear model has a pinna for holding the acoustic device or a hole for holding the acoustic device,
A measurement further comprising a vibration detection element that measures vibration from the acoustic device transmitted from the pinna or the hole in the periphery of the artificial ear canal in a plane intersecting the extending direction of the artificial ear canal of the artificial ear canal apparatus.   The measuring apparatus according to claim 1, wherein the artificial external auditory canal has a length of 5 mm to 40 mm.   The measurement apparatus according to claim 1, further comprising a human head model, wherein the ear mold part is detachable from the head model as an artificial ear constituting the head model.   The measurement apparatus according to claim 1, wherein the ear model and the artificial external auditory canal portion are integrally manufactured from the same material. A measurement method for evaluating an acoustic device that holds a housing including a vibration element by a head including a human ear and hears sound by vibration transmission,
An ear model imitating a human ear, including an auricle for holding the acoustic device or a hole for holding the acoustic device, and an artificial external auditory canal portion connected to the ear model, rubber, or IEC60318 An ear mold made of either the same material as the auricle model compliant with -7, the same material as the auricle model compliant with IEC 60268-7, or a material with a shore hardness of 30 to 60;
Vibration from the acoustic device transmitted through the auricle or the hole is transmitted by a vibration detection element disposed around the artificial external auditory canal on a surface that intersects with the extending direction of the artificial external auditory canal. Measuring method to measure. The measurement method according to claim 5 , wherein the artificial external auditory canal has a length of 5 mm to 40 mm. Further comprising a human head model, the ear-type unit, as an artificial ear constituting the head model, which is detachably attached to the head model, measuring method according to claim 5 or claim 6. The ear model and the artificial ear canal portion measuring method according to any one of claims 5 to 7 in which integrally made of the same material.

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